Rotary machines including a hybrid rotor with hollow and solid rotor blade sets

Abstract

A hybrid rotor may comprise a rotor disk having a peripheral rim, a plurality of solid rotor blades extending outwardly from the rotor disk, and a plurality of hollow rotor blades extending outwardly from the rotor disk in a blade array with the plurality of solid rotor blades. In various embodiments, the plurality of solid rotor blades may be integrally coupled to the rotor disk. In various embodiments, the plurality of hollow rotor blades may be mechanically retained in the rotor disk.

What is claimed is: 
     
       1. A hybrid rotor comprising:
 a rotor disk having a peripheral rim; 
 a plurality of solid rotor blades extending outwardly from the rotor disk; and 
 a plurality of hollow rotor blades extending outwardly from the rotor disk in a blade array with the plurality of solid rotor blades. 
 
     
     
       2. The hybrid rotor of  claim 1 , wherein the plurality of solid rotor blades are spaced around a circumference of the rotor disk in circumferentially spaced apart sets, each set comprising one or more solid rotor blades and the plurality of hollow rotor blades are spaced around the circumference of the rotor disk in circumferentially spaced apart sets of one or more hollow rotor blades, wherein each set of the one or more hollow rotor blades is disposed circumferentially adjacent and between a pair of adjacent circumferentially spaced apart sets of solid rotor blades. 
     
     
       3. The hybrid rotor of  claim 2 , wherein the peripheral rim includes a mechanical retention slot disposed between and adjacent the pair of adjacent circumferentially spaced apart sets of solid rotor blades, the number of mechanical retention slots corresponding to the number of hollow rotor blades in the blade array and each mechanical retention slot configured to retain an individual rotor blade of the hybrid rotor. 
     
     
       4. The hybrid rotor of  claim 3 , wherein each set of the one or more solid rotor blades comprises the same or a different number of solid rotor blades and each set of the one or more hollow rotor blades comprises the same or a different number of hollow rotor blades. 
     
     
       5. The hybrid rotor of  claim 1 , wherein the plurality of hollow rotor blades and the plurality of solid rotor blades respectively comprise the same or different materials. 
     
     
       6. The hybrid rotor of  claim 1 , wherein the plurality of hollow rotor blades and the plurality of solid rotor blades are respectively independently tuned for effecting a different response at an engine stability pinch point. 
     
     
       7. The hybrid rotor of  claim 3 , wherein each individual rotor blade comprises:
 an airfoil having a leading edge and a trailing edge extending from a root portion to a tip portion defining therebetween first and second opposite sides; and 
 a flange integrally joined to the root portion and received in the mechanical retention slot, wherein each mechanical retention slot includes opposing overhung portions cooperating with the flange to retain the individual rotor blade in the blade array. 
 
     
     
       8. A hybrid rotor, comprising:
 an individual rotor blade; and 
 an integrally bladed rotor portion, comprising:
 a rotor disk portion having a peripheral rim configured to mechanically retain the individual rotor blade; and 
 a blade portion comprising an integral rotor blade extending outwardly and integrally from the rotor disk portion, the individual rotor blade configured to extend radially outwardly from the rotor disk portion in a blade array with the integral rotor blade, 
 
 wherein the individual rotor blade is hollow and the integral rotor blade is solid. 
 
     
     
       9. The hybrid rotor of  claim 8 , wherein the integral rotor blade comprises a plurality of integral rotor blades spaced around a circumference of the rotor disk portion in circumferentially spaced apart sets, each set comprising one or more integral rotor blades. 
     
     
       10. The hybrid rotor of  claim 9 , wherein the individual rotor blade comprises a plurality of individual rotor blades spaced around the circumference of the rotor disk portion in circumferentially spaced apart sets, each set comprising at least one individual rotor blade. 
     
     
       11. The hybrid rotor of  claim 10 , wherein each set of the one or more individual rotor blades is disposed circumferentially adjacent and between a pair of adjacent circumferentially spaced apart sets of the integral rotor blades. 
     
     
       12. The hybrid rotor of  claim 11 , wherein the peripheral rim includes a mechanical retention slot disposed between and adjacent the pair of adjacent circumferentially spaced apart sets of the integral rotor blades, the number of mechanical retention slots corresponding to the number of individual rotor blades in the blade array. 
     
     
       13. The hybrid rotor of  claim 11 , wherein each set of the at least one or more integral rotor blades comprises the same or a different number of integral rotor blades and each set of the one or more individual rotor blades comprises a different number of individual rotor blades. 
     
     
       14. The hybrid rotor of  claim 11 , wherein the plurality of individual rotor blades and the plurality of integral rotor blades respectively comprise the same or different materials. 
     
     
       15. The hybrid rotor of  claim 11 , wherein the plurality of individual rotor blades and the plurality of integral rotor blades are respectively independently tuned. 
     
     
       16. The hybrid rotor of  claim 12 , wherein the individual rotor blade comprises:
 an airfoil having a leading edge and a trailing edge extending from a root portion to a tip portion defining therebetween first and second opposite sides; and 
 a flange integrally joined to the root portion and received in the mechanical retention slot. 
 
     
     
       17. The hybrid rotor of  claim 16 , wherein each mechanical retention slot includes opposing overhung portions cooperating with the flange to retain the individual rotor blade in the integrally bladed rotor portion. 
     
     
       18. A rotary machine comprising:
 a rotor disk having a peripheral rim; 
 a plurality of solid rotor blades extending outwardly from the rotor disk; and 
 a plurality of hollow rotor blades extending outwardly from the rotor disk in a blade array with the plurality of solid rotor blades. 
 
     
     
       19. The rotary machine of  claim 18 , wherein the rotor disk and the plurality of solid rotor blades are formed into a single piece and the rotary machine comprises a gas turbine engine. 
     
     
       20. The rotary machine of  claim 18 , wherein each hollow rotor blade comprises:
 an airfoil having a leading edge and a trailing edge extending from a root portion to a tip portion defining therebetween first and second opposite sides; and 
 a flange integrally joined to the root portion and received in a mechanical retention slot, 
 wherein the rotary machine comprises a gas turbine engine.